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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

35943 results found.

  1. GRB 981220:Optical Observations
  2. GRB 981220 optical R and I observations
  3. GRB981226, BeppoSAX Christmas GRB
  4. GRB 981226 - Infrared Observations
  5. GRB 981226 optical observations
  6. GRB 981220
  7. GRB 981220, radio observations
  8. GRB981226 Optical Observation
  9. GRB 981220, radio observations
  10. GRB 981220: BeppoSAX/GRBM results
  11. GRB981220 I-band Observations
  12. GRB 981220
  13. GRB 981220 Optical Observations
  14. GRB 981220, optical observations
  15. GRB 980326/Host Galaxy
  16. GRB981220 IPN error box
  17. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  18. GRB980329 R,I flux calibration and R,I,K upper limits
  19. GRB980425: X-ray revised positions
  20. GRB 980923 BATSE Observations
  21. GRB980703 Very Long Baseline Interferometry
  22. GRB970508 optical observations
  23. GRB971214, association with a Galactic star?
  24. Optical Observations of the Host Galaxy of GRB 980519
  25. GRB980519, Optical Observations
  26. GRB980703, Host galaxy multicolor photometry
  27. GRB980703 - BeppoSAX/GRBM detection
  28. GRB 980703 (NFI observations)
  29. GRB980703 optical photometry
  30. GRB 980703: BATSE Observations
  31. GRB980703: Radio transient
  32. GRB980703 H-band Observations
  33. GRB 980703: Spectrum of the proposed optical counterpart
  34. RXTE Observation of GRB 980706
  35. GRB980703: Spectrum of the proposed optical counterpart
  36. GRB980703 Transient Optical Follow-Up
  37. GRB980703: LOTIS observation at early times
  38. GRB980613 Optical Observations
  39. GRB 980703
  40. GRB 980703 H-band Observations
  41. GRB980703 (optical R observations)
  42. GRB980706
  43. GRB980703: radio source/optical transient
  44. BeppoSAX NFI observations of GRB 980703
  45. GRB 980703: ASM Position & Intensity
  46. GRB980703
  47. GRB980703 optical followup
  48. GRB 980613 Near-IR observations
  49. GRB980613, optical observations
  50. GRB 980613: Optical transient and its host galaxy
  51. GRB 980613: Detection of the probable host galaxy
  52. GRB 980613: BATSE Observations
  53. GRB 980613 Optical Observations
  54. GRB 980613 optical observations
  55. GRB980613 Optical Observations
  56. GRB980613 observations from Palomar
  57. GRB980613 BeppoSAX-NFI follow up
  58. GRB 980613 new optical/IR observations
  59. GRB 980613 optical/IR obs.
  60. GRB980613 Near Infra-Red Observations
  61. GRB980611
  62. GRB980613, BeppoSAX WFC positions
  63. GRB971214 Secondary Standards
  64. GRB980519 Secondary Standards
  65. BATSE on-board GRB trigger change
  66. GRB 980519 Optical Observations
  67. GRB980519 optical observations
  68. GRB 980519
  69. GRB980519 optical observations
  70. GRB 980519 Optical Observations
  71. GRB980519 BATSE Observations
  72. GRB970519, optical follow-up at Schmidt Calern
  73. GRB980519 optical observations
  74. GRB980519 Optical Observations
  75. GRB980519 Optical Observations
  76. GRB980519 IPN POSITION
  77. GRB980519 Optical Observations
  78. GRB 980519 Optical Observations
  79. GRB980519 optical observations
  80. GRB980515, BeppoSAX IAUC to be submitted
  81. BATSE on-board GRB trigger change
  82. BeppoSAX GRB ALERT: updated position of grb980515
  83. GRB 980425 Radio Light Curve
  84. GRB 980425 Brightness Temperature
  85. GRB980425 BATSE observations
  86. SAX J0840.7+2248 Optical Observations
  87. GRB 980425 optical observations
  88. GRB980425: optical obs.
  89. GRB980425: Radio Observations
  90. GRB 980425 optical observations
  91. GRB 980425 optical observations
  92. GRB 980329 ROSAT observation
  93. GRB980326 X-ray Observations
  94. GRB980326, optical observations
  95. GRB980326, optical observations
  96. GRB980329, Fading IR counterpart to radio source
  97. GRByymmdd, Announcement of automation
  98. GRB980326 IPN annulus
  99. GRB980329 sub-millimeter observations
  100. GRB980329 IPN annulus

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